EFFECTS OF EXTRUSION BLOW MOLDING INTERNAL COOLING ...

container size and volume on cooling time and container shrinkage is
recommended.
5.5 Environmental Stress Cracking
Another important test which could be run on these containers is an
environmental stress cracking test. Comparisons could be made between the
two manufacturing methods following the test procedures outlined in ASTM
D2561-95, Environmental Stress-Crack Resistance of Blow-Molded Polyethylene
Containers.
5.6 Impact Testing
Impact testing of HDPE containers is difficult through standard testing methods
including ASTM D 2463-95 Drop Impact Resistance of Blow-Molded
Thermoplastic Containers. The problem lies in the incredibly high inherent
strength of the materials. Preliminary testing failed to produce any impact failure
at all. Possible solutions to this problem could include freezing of the containers
before testing to increase brittleness.
5.7 Torque Testing
The different manufacturing methods could potentially produce different results in
closure torque testing. Application and removal torque could be tested for each
of the containers.
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